Machine for operating on inner tubes



1954 J. A. RENICK EIAL 2,586,553

MACHINE FOR OPERATING ON INNER TUBES Filed June 4, 1951 6 Sheets-Sheet l W 7 nv 52 25 43VI I 5 26 I02 "I; |o|

\ 23 M |0 |\Sl) 0'3 VI v 2n 1' 6-! /-o 1 '1 I 1 J INVENTOR. 36 JAMES A. REN-ICK WILLIAM R. BALDWIN A TTORNEY.

g- 7, 1954 J. A. RENICK s-rAL 2,686,553

MACHINE FOR OPERATING ON INNER TUBES Filed June 4, 1951 '6 Sheets-Sheet 2 INVENTOR. I JAMES A. RENICK WILLIAM R. BALDWIN JMWXZLI A TTORNE Y.

Aug. 17, 1954 J. A. RENICK- ETAL 2,635,553

MACHINE FOR OPERATING 0N, INNER TUBES Filed June 4, 1951 s Sheets-Sheet 3 I JAMES-A REJPQIE T vvILLIAM' BALDWIN ATTORNEY.

Aug. 17, 1954 J. A. RENICK ETAL MACHINE FOR OPERATING ON INNER TUBES Filed June 4 1951 60 v-: I 64 65 I s I Sa 23 I I 62 29 6 Sheets-Sheet 4 'INVENTOR.

Aug 17, 1954 J. A. RENICK ETAL 2, 86,553

MACHINE FOR OPERATING 0N INNER TUBES Filed June 4, 1951 [Les 6 Sheets-Sheet 5 BY WILLIAM R. BALDWIN ATTO/PA/[Y F N i 5 0 3 M ENLD Q O m 0 m O IO 8 O um I m N o m 1 I 8 L. T} I N I 1 4| 8 8 N Nv- Mfi If Aug. 17, 1954 .1. A. RENICK ETAL 2,686,553

MACHINE FOR OPERATING ON'INNER TUBES Filed June 4, 1951 6 Sheets-Sheet 6 1 /L T n 5) I Q I 0 m I 8/ Q 5- l- 2 I N cu S INVENTOR. JAMES A. RENICK By WILLIAM R. BALDWIN ATTORNEY Patented Aug. 17, 1954 MACHINE FOR OPERATING ON INNER TUBES James A. Renick, Beech Grove, and William R. Baldwin, Kokomo, Ind., assignors to United States Rubber Company, New York, N. Y., a corporation of New Jersey Application June 4, 1951, Serial No. 229,846

15 Claims 1 This invention relates to apparatus for use in manufacturing rubber inner tubes. In particular, it relates to a machine for punching a hole in a section of uncured inner tube stock, securing a rubber based valve stem over the punched hole, and injecting a predetermined amount of anti-static compound within the tube.

It has been heretofore proposed to put conductive carbon black particles in an inner tube to prevent buildup of static electricity in the inner tube while it is in service. In copending United States application, Serial No. 138,072, filed January 11, 1950, by H. D. Hiatt, G. P. McCord, and L. 0. Peterson, assigned to the same assignee as the instant case, and now U. S. Patent No. 2,650,641, it was proposed as a convenient method of applying the carbon black particles, to mix the particles with a volatile organic liquid to form a paste and apply this paste to the interior of the inner tube. The volatile organic liquid would evaporate during the subsequent curing of the tube leaving the free carbon particles within the tube.

It is one object, therefore, of the present invention to provide a single machine which will punch a hole in the inner tube stock, apply a rubber based valve stem over the punched hole and inject a predetermined amount of anti-static paste or compound within the tube.

Another object of the invention is to provide a single machine which will perform all the above operations While the tube is maintained in a stationary position, thereby minimizing the handling of the tube by the operator.

A still further object of the invention is to provide a machine having a novel arrangement of the punch and valve applying mechanisms which is simple in operation and construction.

A still further object of the invention is to provide a machine for use in manufacturing inner tubes which has a novel anti-static paste agitating and injecting mechanism whereby it is insured that the anti-static paste is thoroughly mixed before injection.

Other objects and advantages of the invention will become apparent from the following description when read in conjunction with the accompanying drawings, wherein:

Fig. l is a side elevational view of the machine of the invention showing a piece of inner tube stock clamped in place over the anvil and the punch in punching position,

Fig. 2 is a partial front elevational view of the machine also showing a piece of inner tube stock clamped in place over the anvil and the punch. in punching position,

Fig. 3 is an elevational view of a portion of the machine showing the relationship of the anvil, inner tube section, clamp, and valve applicator,

Fig. 4 is a partial sectional view of a portion of the machine showing the details of the anvil, clamp and punch in relationship to an inner tube section clamped to the anvil,

Fig. 5 is a sectional view of a portion of the machine showing the relationship of the anvil, clamp, and valve applicator in applying a valve stem to the inner tube section,

Fig. 6 is an enlarged sectional view taken on the line VI-VI of Fig. 1, showing details of the anvil, clamp and valve applicator and also the relationship of these elements in applying a valve stem to the inner tube section,

Fig. 7 is a view taken on the line VII-VII of Fig. 1, showing the details of the linkage for operating the clamp,

Fig. 8 is a sectional view taken on the line VIII-VIII of Fig. 4 showing the details of the punch, anvil and clamp,

Fig. 9 is a view taken on the line IX-IX of Fig. 1, showing further details of the linkage for operating the clamp,

Fig. 10 is an elevational view of the anti-static paste agitator and injecting mechanism,

Fig. 11 is a sectional view taken along the line XI-XI of Fig. 10, showing details of the power take off mechanism for the agitator, and

Fig. 12 is a schematic drawing of the piping diagram, including the operating air cylinders and portions of the machine which they operate. Referring to the drawings, and in particular to Fig. 1 of the drawings, the machine includes a frame it. Frame it includes a vertical section I l and a horizontal section l2. secured to the top of the section H. A supporting plate i3 is secured to the end of horizontal section i2 as is best shown in Fig. 2. I

An elongated anvil I4 extends from and is secured to vertical section II of frame It at a substantial distance below the horizontal section 12. Anvil is adapted to have'a piece of inner tubestock T slipped over its free end as shown in Fig. 1.

A clamping mechanism I 5 pivoted to the'frame at His adapted to clamp the tube stock to the anvil. A punching mechanism [7, pivotally attached to the supporting plate- It as best shown in Fig. 2, moves in an arcuate path toward and away from the anvil M to punch a hole in the section of tube stock T clamped to the anvil.

A valve stem applicating'mechanism I8 is also secured to the plate, I3 directly above the anvil l4. After the punch I! has moved in and I 3 punched a hole in the tube T, and then moved away, the valve stem applicator moves down to apply a valve stem over the punched hole.

A nozzle 19 is provided on the free end of the anvil Hi. A measured amount of anti-static compound is supplied to the nozzle IS- by a supplying and injecting mechanism 20 (Fig. 10) and is injected into the interior of the tube T carried by the anvil 14. The anti-static compound may be of the type disclosed in United States application Serial No. 138,072, now U. S. Patent No. 2,650,641, previously refered to. The compound is spread in the tube by a blast of air as will be hereinafter described.

The various elements of the machine are air operated by a series of valves and air cylinders as will be described in detail hereinafter.

The above gives a brief description of the structure and function of the machine, and the details of the individual elements will now be given.

Clamping mechanism The clamping -mechamsm l5 includes two parallel bars 2|, pivotally attached at It to a base plate 22 of the anvil, M, which in turn is secured to the frame In. Fastened to the free ends of the bars 2| is a clamping plate 23 which clamps the inner tube stock section T to the anvil I4. Plate 23 is provided with an opening 24 (Fig. 4) adjacent its end to allow the punch to pass therethrough to punch. a hole in the tube section, and to allow the applicator to apply a valve stem over the punched hole as will hereinafter he described.

An extension spring 25 (Fig. 1) fastened at one end to the bars 2:! and at the other end to a reinforcing plate 26, nominally urges the clamp l5 upwardly toward a non-clamping position. The clamp I5 is initially moved to clamping position by a mechanical linkage. The linkage includes, as best shown in Figs. 1, '7 and 8, a shaft 21 suitably journaled in a bearing 23 anixed to the plate I3 and a bearing 29 secured to the lower side of the horizontal section l2. A manually operable lever 30 is attached to the shaft 21 at one end and a crank arm 3| is attached to the shaft adjacent the other end. A connecting link 32 is pivotally attached at one end to the outer end of the crank arm 3! and is pivotally attached at the other end by means of a modified ball and socket joint 33,. to the parallel bars 2| of the clamp 45. When the lever 39 is manually turned in a clockwise direction as viewed in Fig. 2, the motion is translated by the shaft 2?, crank arm 3|, and link 32 to move the clamp l 5 into clamping position.

At the same time the lever 30 is manually turned, a cam 34 (Fig. 7) which is also secured to the shaft 21 turns and operates a three way control valve V-i. Operation of valve V-I in conjunction with a valve V-4 and a valve V-B admits air under pressure to'an air cylinder 0-! to withdraw the piston rod 35 thereof. Air cylinder C-I is pivotally attached at one end to a bracket 36, which in turn is secured to the vertical section H of the frame it. The piston rod 35 is connected to a cross bar 31 of a draw frame 38 which in turn is pivotally attached to the parallel bars 2| of the clamp 15. A compression spring 39 is disposed around the piston rod 35 and abuts the end of the air cylinder (3-! at one end and the cross bar 31 at the other end. Spring 39 serves to return the piston rod 35 to its extended position when the pressure is released in the air cylinder Cl. A spring 40 is carried by the piston rod 35 on the opposite side of the cross bar 3'! from the spring 39 and is retained thereon by nuts 41 threaded on the end of the piston rod 35. The spring 40 serves as a shock absorbing or cushioning element when the iston rod 35 is withdrawn.

This arrangement whereby the initial clamping is performed manually, is provided so that the tube will be held in clamped position until the air cylinder 0-! takes control of the clamping and also a a safety measure to utilize both hands of the operator as will be later brought out.

Punch mechanism The punch mechanism IT as best shown in Figs. 1, 2 and 4. includes a hollow punch 42, tapered to a sharp lower cutting edge 42a. The hollow punch 42 is secured to and communicates with the interior of a receptacle or box 43. The punch 42,. as best shown in. Fig. 8, is mounted for limited universal movement in the bottom of the receptacle 43 by means of a ring nut 44 and a ring nut 45. Nut 44 is both internally and externally threaded and screws into a threaded opening in the. bottom of the receptacle 43. Nut M is also provided at its lower end with an internal retaining flange 41. A rubber or leather compressible washer 43 is carried by the flange H and is engaged by an external flange 49 on the upper end of the punch 42. Ring nut 45 is. provided with an internal taper at its lower end. Ring nut 45 is screwed into the nut M and the tapered portion thereof engages the flange 49 of the punch 152. This arrangement in conjunction with the compressiblev washer 48 allows the punch to have some universal movement.

This feature of universal movement allows the punch to properly align itself when it engages. the rubber so that the. cutting pressure will be uniform throughout the cutting edge, and the punch will cut through the rubber completely around its periphery. Without such universal movement, it would benecessary that the punch be accurately set. so that its cutting edge was exactly parallel with the anvil surface. By mounting the punch for limited universal movement this parallel setting is taken care of automatically when the punch engages the tube section.

Box 43 is secured to one end of a lever 50. Lever 5G is journaled intermediate its extremities on a pivot pin 5!- which is secured to the supporting plate 53. The opposite end of the lever 58 is pivotally attached by a pin 53 to the free end of a piston rod 52 of a double acting air cylinder (3-2 which is pivotally attached to the plate l3. Admission of air under pressure to the air cylinder 0-2 to extend the piston rod 52 pivots the punch 42 by means of the lever 50 to the position shown in the dotted lines of Fig. 2. Admission of air under pressure to the air cylinder 0-2 to withdraw the piston rod moves the punch 42 to the punching position as shown in the solid lines of Fig. 2.

As can be best seen in Fig. 4, in punching position, the punch 42 extends through the opening 24 in the clamping plate 23 to punch a hole in the tube section T. The opening in the hollow punch in this position is concentric with the opening in a hardened bushing 54 carried in and flushed with the top of the anvil M. The opening in the bushing 56 communicates with a passage 55 provided in the anvil l4. Passage 55 is connected to an air hose 56 which in turn is connected to a source of air under pressure. Air under pres- 43. When the punch .42 and box 43 are pivoted.

to the non-punching position as shown by the dotted lines in Fig. 2, the slugs drop by gravity from the box 43, the rear end of the box being left open for this purpose, to the fioor or into a receptacle (not shown) placed below the machine.

Two control valves V-2 and V-3 (Fig. 2) are secured to the plate I 3 on the opposite side thereof from the air cylinder 0-2 and the punch 42. These valves are both lever operated, self closing valves. The valves are actuated by an extension of ,the pin 53 of the lever 59, which extends through an arcuate slot 51 (Fig. 2) in the plate I3. Actuating lever 59 of valve V-3 extends across one end of the slot 51 and actuating lever 59 of valve V-Z extends across the other end of the slot 51, so that as the extension of pin 53 moves to either end of the slot, it will actuate either valve V-Z or V-3. Valve V-3 controls the blast of air used in ejecting the rubber slug up through the hollow punch 42 and valve V-2 is a safety device to prevent operation of the valve applicating and anti-static compound injecting mechanisms until the punch 42 has moved back to non-punching or rest position as will hereinafter be described.

Valve stem applicating mechanism The valve stem applicating mechanism I8 forapplying rubber based valve stems, includes an air cylinder 0-3 and a valve stem holder 69 secured to the free end of the piston rod 6| thereof as best shown in Figure 2. The air cylinder 0-3 is secured to the supporting plate I3 directly above the bushing 54 of the anvil I4. The valve stem holder 69 secured to the free end of the piston rod BI is reciprocated toward and away from the anvil to apply a rubber covered valve stem over a previously punched hole in the tube section T. A rubber insert 62 (Fig. 6) is provided in the anvil I 4 surrounding the bushing 54 to distribute the pressure uniformly over the stem base Sa in applying the valve stem S. The bushing 59 is retained in the anvil I4 by means of a set screw 93 as best shown in Fig- 6.

The valve stem holder 69 has an opening 64 in the end thereof, shaped to correspond with the outside surface of the valve stem S, including the flange portion Sa, so that uniform pressure may be applied thereto in applying it to the tube section T. The valve stem S is manually inserted in the opening 94 and is retained therein by a spring pressed ball detent 65.

After the punch 42 has punched a hole in the tube section T and has moved back to non-punching position, the'valve applicating means moves down to apply a rubber based valve stem, which has previously been inserted in the holder 99, over the punched hole. When the holder 69 moves back again, the valve stembeing now bonded to the tube is pulled out of the holder and remains secured to the tube.

Anti-static compound supplying and infecting mechanism meral 29. The mechanism includes a hopper 96, I

. secured to each end thereof.

The hopper 69 is provided with an agitator or mixer 69. The agitator 99 includes a shaft I9 having agitator blades 'II attached to the lower end thereof and extending radially therefrom. The shaft 19 extends up and out of the hopper. Two journal bearings I2 and 13 secured to a frame 14 give the shaft 19 support. A collar I5 secured to the shaft I9 adjacent the bearing I2 takes the thrust of the shaft in an upward direction. A bevelled gear 16 is carried by and secured to the upper end of the shaft I9.

Bevelled gear 76 meshes with a bevelled gear 1! carried on and secured to the end of a horizontal shaft 19. The shaft I9 is mounted for rotation in journal bearings 19 and 89 secured to a plate 8| which in turn is carried by frame 14. A pinion 82 (Fig. 11) is secured to the shaft 79 intermediate its ends and is engaged bya vertically extending rack 83. The rack 83 is held in engagement with the pinion 82 by means of back up roller 84 mounted for rotation on a spindle 85 carried by two spaced angles 89 which are fastened to the plate 8|.

Rack 83 is secured to the end of a piston rod 81 of an air cylinder 0-4. secured'to a vertical plate 98 which is supported by and secured to a horizontal frame work 89. Frame work 89 also supports hopper 95.

The piston rod 81 extends completely through the air cylinder 0-4 so that it has two operating ends. The lower end of the piston rod 8! is secured to a rack 99, similar to rack 93. The rack' Admission of air pressure to air cylinder 0-4 reciprocates piston rod 91 and racks 83 and 99 Reciprocation of rack 83 drives pinions 32, which turns shaft I8. Shaft I8 drives shaft 79 through bevelled gears 16 and I1. Rotation of shaft 19, rotates agitator blades II to thoroughly mix the anti-static paste in the hopper 99.

The pump 9| is of the worm type disclosed in United States Patent No. 2,028,407. The intake side 93 of the pump 9| is positioned directly below the hopper 96 and is connected to the hopper by means of conduit 94. The bottom -of the hopper is provided with a discharge funnel 95., the lower smaller end of which is connected to the conduit 94. The anti-static paste is drawn down through the funnel 95 and conduit 94 into the pump 9| and is discharged from the discharge end 96 of the pump into the conduit ZI'I. 0onduit 2| 1 is connected to the nozzle I9 (Fig. 1) carried by the end of the anvil I4. I

The pump 9| is driven by rack 99 by means of a gear (not shown) similar to gear 92. The gear is carried by and secured to a shaft 91, suitably journalled in bearings 98. The gear is concealed by the rack 99 in Fig. 10. Shaft 91 is connected to drive shaft 99 of the pump by means of a unidirectional clutch I99. Clutch I99 allows the pump to be rotated in only one direction.

When air under pressure is admitted to the cylinder 0-4 to move the piston rod 81 in a downward direction, it drives racks% and 99. Rack 93, as previously described, drives the agitating blades II and rack 99 drives the pump 9I. In this manner, the anti-static paste or compound Air cylinder 0-4 is will be thoroughly mixed and a predetermined amount of paste will be discharged by the pump 91. When the air pressure in the cylinder -6 is reversed, the pump Will not operate because of the uni-directional clutch Hill. Thus, it is only on the down stroke of the piston rod 81 that the anti-static compound will be discharged into the conduit 2H.

Fluid control system and cycle of operation Fig. 12 shows the piping diagram for the machine including the fluidv motors and control valves. In the drawing, all the valves are shown in their non-actuated position and all the valves are self closing.

Before initially operating the machine, the operator manually places the section of inner tube stock T over the anvil l4 and inserts a rubber covered valve stem S into the valve stem holder 66 of the valve applicating mechanism It.

After the above preparatory operations, the operator then manually operates valve V-l by turning lever 3! (Fig. l) with one hand. Operation of valve Vl admits air under pressure from main pressure line 268 to conduits 2m and 202. As previously described, turning of lever 38 also mechanically moves the clamping mechanism 15 into clamping position. With the other hand the operator manually operates valve V- i by pressing lever 38a (Figs. 1 and 2).

Operation of valve V-4 admits pressure from conduit 20! into conduits 283, 264 and 255. Admission of air pressure to conduit 52% operates pressure operable valve V-5 to connect the upper end of air cylinder 0-2 to atmosphere. Admission of pressure to conduit 265 pressurizes the lower end of the air cylinder (3-2 to withdraw the piston rod 5'12 thereof and thereby move the punch 42 into punching position to punch a hole in the piece of tube stock T clamped to the anvil Hit Admission of pressure to conduit 2G4 operates a pressure operable valve V-S to admit air under pressure to conduit 2% to pressurize the upper end of fluid motor 6-! to Withdraw the piston rod 35 thereof to apply clamping pressure to the clamping mechanism i5. At this point, therefore, the air cylinder 0-! takes over the clamping operation previously performed by mechanically turning lever 3d of valve V-l.

When the punch 42 is in the non-punching position, valve V-2 is open, being operated by the pin 53 on the lever 58 of the punching mechanism. Valve V-3 is closed at this point. As soon as the punch 42 starts its downward movement, valve V-2 is released and closes, thereby cutting off pressure to conduit 29?. When the punch 62' reaches punching position, it operates valve V-S to open it. Opening the valve V-3 connects air hose 56 (Fig. 4) to the main pressure line 2138 through conduit 208. Admission of pressure to air hose 55 serves to eject the out rubber slug up through the hollow punch 52 as previously described.

It can be seen, therefore, that for the clamping and punching operation to take place, it is necessary that the operator must use both hands inv operating valves VI and V- l. This is a safety feature to insure that the operator will not operate valve V-l, which controls the other operations, while the punching operation is taking place. Valve V-Z also serves as a safety feature, as it prevents pressure from being admitted to conduit 2t? and therefore valve V-l until the punch 52 is in. non-punching or rest position.

As soonas the punch 42 completes the punchingv operation, the operator releases valve V4 thereby cutting off the pressure to conduits 203, 204 and 265 and opening them to atmospheric pressure. Releasing valve V- l also connects the upper end of the fluid motor 0-2 to the main pressure line 2&0 through conduit 208 to thereby withdraw the piston rod 52 and move the punch to nonpunching or rest position.

Valve V-5 is provided with a time delay device to hold the pressure in the fluid motor C-l to maintain the clamping pressure while the valve stem is being applied over the previously punched hole. The time delay device consists of the operating pistons or diaphragms 3538 of the valve V-B which in conjunction with a restricted orifice bleed vent till acts as a dash pot. A check valve 3 32 prevents reverse flow in conduit 264. Valve V-ii is a well known commercial type valve and the check valve 382 is made as integral'part of the valve.

After releasing valve V- i and while still holding valve 5-1, the operator presses valve V-l by pressing lever 3% (Figs. 1 and 2'). Valve V-l connects conduit 28's with conduits 2G9 and 2m.

As soon as punch 12 returns to non-punching or rest position it operates valve 1-2 to admit pressure from main pressure line 23% through valve V-l and conduit 282 to conduit Zill and from conduit 2M to conduits 269 and Zlll through valve V-i.

Pressure admitted to conduit 2&9 passes to a cut-out valve 383. Cut-cut valve 3&3 is a well known commercial type which allows only a predetermined amount of air pressure to pass and then closes. This is accomplished by a spring pressed sliding piston 3M. When pressure is admitted to this valve, the piston 353d is forced to the opposite end of the valve to seal off conduit 2i 5. However, during the time it takes the piston to move to the sealing position, a predetermined amount of air'pressure passes out through openings Stiprovided adjacent the end of thepiston and into the conduit 2H. Pressure in conduit 2i i operates pressure operable valve V-fl to connect conduit 2!; to the main pressure line 2th; through conduit H3. Conduit 252 is connected to the upper end of air cylinder 0-3 and the admission of pressure thereto, pressurizes the upper end of the air cylinder (2-3 to extend the piston rod Si thereof to apply a valve stem previously inserted in the valve stem holder 60 to the hole previously punched in the tube section T clamped to the anvil it. At the same time, admission of pressure to line conduit 212 operates pressure operable valve V-S to connect the lower end of the air cylinder C-3 through conduit 214 to atmosphere.

The function of the cut-oil valve 353 is to prevent the operator from allowing the pressure exerted by air cylinder 0-3 in applying the valve stem to be maintained for too great a length or time. As the tube and Valve stem are made of uncured rubber, the maintenance of the applicating pressure for too great a period of time would cause undesirable plastic how or" the tube material. By utilizing a cut-ofi valve in the line, only enough pressure will be allowed to pass to operate the valve V-8, regardless of how long the operator holds the valve V-l open. The time interval necessary for proper application of the valve stem is controlled by a time delay device on the valve V-t. This device includes the operating piston or diaphragm 3535 of the valve V-fl, a restricted orifice 3G3 and a check valve 308,

and operates in the same manner as the time delay device for valve V-B, previously described. Like valve V-6, valve V-8 is a commercial valve which comes equipped with the check valve 308. The time delay is set to allow sufficient time for the piston rod 6| and valve stem holder 60 to move down and apply the valve stem and to maintain the applicating pressure for the desired interval.

When the valve V-8 opens under the influence of the time delay, conduit H2 and therefore the upper end of the fluid motor C-3 is connected with atmospheric pressure and valve V-9 opens to connect the lower end of the air cylinder -3 with the main pressure line 290 through conduits 2l3 and 214 to withdraw the piston rod BI and holder 60.

Air cylinder 04 which operates the anti-static compound supplying and injecting mechanism 20 is connected in parallel with air cylinder 0-3 by means of conduits H5 and 2 I6 and consequently operates simultaneously with air cylinder C-- 3 to inject the anti-static compound into the tube clamped to the anvil. The anti-static compound passes through a conduit 2H to the nozzle [9 secured to the end of the anvil l4.

' To assist in spreading the anti-static compound within the tube, the nozzle I9 is also connected to the main pressure line 200 by means of conduits 218 and 219. Admission of air pressure is controlled by pressure operable valve V-ID. Valve V-IO is operated from conduit 2H) which is connected to valve V-l so that the air supply to the nozzle will occur simultaneously and for the same length of time as the injection of the anti-static compound. Conduit 2 I0 is provided with a cut-off valve 309, identical with cut-off valve 303 and valve V-lll includes a check valve 3H! and a restricted orifice 3 similar to that provided on valves V-G and V-B.

As can be seen in Fig. 1, the anti-static compound and air first enter a common chamber I 0-! in the nozzle IS. The anti-static compound enters through a concentric tube I02 extending into the chamber while the air enters through a passage l03 in the side wall of the chamber. The chamber is shaped to give a Venturi effect to increase the velocity of the air to give a good spraying action. The anti-static compound, therefore, is spread quite evenly Within the interior of the tube. I

It can be seen that the above-described machine will perform the operations of punching a hole in an inner tube section, applying a rubber based valve stem to the punched hole and injecting anti-static compound into the interior of the inner tube section in an efficient manner While the tube is maintained in a stationary position. Once the operator has placed the inner tube section on the anvil of .the machine, he need not handle the tube section again until the operations have all been completed. When the tube section is removed from the machine, it is ready for the splicing and curing operation.

Having thus described our invention, what we claim and desire to protect by Letters Patent is:

1. A' machine for operating on inner tubes comprising, an anvil over which an inner tube is adapted to be slipped, means for clamping the tube to the anvil, means for punching a hole in the tube, means for applying a valve stem over the punched hole, and a nozzle carried by said anvil for injecting an anti-static compound into the tube.

2. A machine for operating on inner tubes com- 10 prising, a frame, an elongated anvil secured to and extending from the frame, said anvil being adapted to have a section of unspliced inner tube stock slipped thereover, clamping means carried by said anvil for clamping th section of inner said anvil for injecting an anti-static compound into the tube section While it is carried by the anvil.

3. A machine for operating on inner tubes comprising, a frame, an elongated anvil secured to" and extending from the frame, said anvil being adapted to have a section of unspliced inner tube stock slipped thereover, clamping means carried by said anvil for-clamping the section of inner tube stock thereto, a punch pivotally mounted on said frame and adapted to punch a hole in said section of inner tube stock carried by said anvil, a valve stem applicator carried by said frame above said anvil for applying a valve stem to said previously punched hole, a nozzle carried by said anvil for injecting an anti-static compound into the tube section While it is carried by the anvil, and means for supplying a measured amount of the anti-static compound to said nozzle. l 4. A machine for operating on inner tubes comprising, a frame, an elongated anvil secured to and extending from said frame, said anvil being adapted to have a section of inner tube stock slipped thereover, means for clamping said tube section to said anvil, means carried by said frame for punching a hole in said tube section, means carried by said frame for applying a valve stem over a previously punched hole, a nozzle secured to the end of said anvil, and means for injecting anti-static compound through said nozzle into the interior of the tube section.

5. A' machine for operating on inner tubes comprising, a frame, an elongated anvil secured to and extending from said frame, said anvil being adapted to have a section of inner tube stock slipped thereover, means for clamping said tube section to said anvil, means carried by said frame for punching a hole in said tube section, means carried by said frame for applying avalve stem over a previously punched hole, a nozzle secured to the end of said anvil, and a pump for injecting a measured amount of anti-static compound through said nozzle into the interior of the tube section.

6. A machine for operating on inner tubes comprising, a frame, an elongated anvil secured to and extending from said frame, said anvil being adapted to have a section of inner tube stock slipped thereover, means for clamp-.

ing said tube section to said anvil, means carried by said frame for punching a hole in said tube section, means carried by said frame for applying a valve stem over a previously punched hole, a nozzle secured to the end of said anvil, a pump for injecting a measured amount of anti-static compound through said nozzle into the interior of the tube section, and means for supplying air under pressure to said nozzle to spread the antistatic compound around the interior surface of the innertube.

'7. A machine for operating on inner tubes comprising, a frame, an elongated anvil secured to and extending from said frame, said anvil being adapted to have a section of inner tube stock slipped thereover, a punch pivotally mounted on said frame for movement along an arcuate path toward and away from said anvil, a valve stem applicator secured to said frame and positioned above said anvil, and adapted to apply a valve stem to said inner tub after said punch has punched a hole in said tube and moved away from said anvil.

8. A machine for operating on inner tubes comprising, a frame, an elongated anvil extending from and secured to said frame, said anvil being adapted to have a section of inner tube stock slipped thereover, means for clamping said tube section to said anvil, a hollow punch pivotally mounted on said frame for movement toward and away from said anvil, means for moving said hollow punch to punch a hole in said tube section, valve stem holding means, and means for moving said valve stem holding means toward said anvil to apply a valve stem over a previously punched hole in said tube section after the punch has been moved away from said anvil.

9. A machine for operating on inner tubes comprising, a frame, an elongated anvil extending from and secured to said frame, said anvil being adapted to have a section of inner tube stock slipped thereover, means for clamping said inner tube section to the anvil, a hollow punch pivotally mounted on said frame for movement toward and away from said anvil, means for moving said hollow punch to punch a hole in said tube section, an opening in said anvil positioned to be in alignment with said hollow punch when it is in punching position, means connecting said opening with a source of air I under pressure whereby the air under pressure will force the plug cut in the punching operation up through the hollow punch, valve stem holding means, means for moving said valve stem holding means toward and away from said anvil to apply a valve stem over the previously punched hole in said tube section after the punch has been moved away from said anvil.

10. A machine for operating on inner tubes comprising, a frame, an elongated anvil secured to and extending from said frame, said anvil being adapted to have a section of inner tube stock slipped thereover, means for clamping said inner tube stock to said anvil, a lever pivotally mounted on said frame, a receptacle carried by one end of said lever, a hollow punch secured to and extending into said receptacle, means for pivoting said lever to move said punch toward said anvil to punch a hole in said tube section, an opening in said anvil in concentric alignment with said hollow. punch when said punch is in punching position, and means connecting said opening with a source of air under pressure whereby a slug punched from said tube will be ejected up through said hollow punch into said receptacle.

.11. A machine for operating on inner tubes comprising, a frame, an elognated anvil secured to and extending from said frame, said anvil being adapted to have a section of inner tube stock slipped thereover, means for clamping said inner tube stock to said anvil, a lever pivotally mounted on said frame, a receptacle carried by one end of said lever, a hollowpunch secured to and extending into said receptacle, means for pivoting said lever to move said punch toward said anvil to punch a hole in said tube section, an opening in said anvil in concentric alignment with said hollow punch when said punch is in punching position, means connecting said opening with a source of air under pressure whereby a slug punched from said tube will'be ejected up through said hollow punch into said receptacle, said receptacle being open at the rear end thereof whereby when said punch and receptacle are moved back to non punching position, the slug previously ejected into said receptacle will drop out of said receptacle through said opening.

12. A machine for operating on inner tubes comprising, a frame, an elongated anvil secured to and extending from said frame, said anvil being adapted to have a section of inner tube stock slipped thereover, means for clamping said inner tube stock to said anvil, a lever pivotally mounted on said frame, a receptacle carried by one end of said lever, a hollow punch extending into said receptacle, means for mounting said hollow punch for limited universal movement with respect to said receptacle, means for pivoting said lever to move said punch toward said anvil to punch a hole in said tube section, an opening in said anvil in concentric alignment with said hollow punch when said punch is in pimching position, and means connecting said opening with a source of air under pressure whereby a slug punched from said tube will be ejected up through said hollow punch into said receptacle.

13. In a machine for operating on inner tubes the combination comprising, a frame, an elongated support secured to and extending from the frame, said support being adapted to have a section of unspliced inner tube stock slipped thereover, a nozzle carried by said support, a hopper for anti-static compound, means supporting said hopper adjacent to said support, agitator means supported by said hopper supporting means and extending into said hopper for mixing compound in said hopper, a pump carried by said hopper supporting means, the intake side of said pump being connected to said hopper and the output side of said pump being connected to said nozzle, and means for simultaneously operating said agitator means and said pump whereby a predetermined amount of freshly mixed anti-static compound may be forced through said nozzle into the interior of the tube section.

14. In a machine for operating on inner tubes the combination comprising, a frame, an elongated support secured to and extending from the frame, said support being adapted to have a section of unspliced inner tube stock slipped thereover, a nozzle carried by said support, a hopper for anti-static compound, means supporting said hopper adjacent to said support, agitator means supported by said hopper supporting means and extending within said hopper for mixing compound in said hopper, a pump carried by said hopper supporting means, the intake side of said pump being connected to said hopper, the output side of said pump being connected to said nozzle, means for connecting said nozzle to a source of air under pressure, and means for simultaneously operating said agitator means, pump, and connecting means whereby a predetermined amount of freshly mixed anti-static compound may be forced through said nozzle into the interior of the tube and spread within the tube by a blast of 15. In a machine for operating on inner tubes the combination comprising, a frame, an elongated support secured to and extending from the frame, said support being adapted to have a section of unspliced inner tube stock slipped thereover, clamping means carried by said frame for clamping said section of the inner tube stock to said support, a nozzle carried by saidsupport,

a hopper for anti-static compound, means supporting said hopper adjacent to said support, agitator means supported by said hopper supporting means and extending Within said hopper for mixing compound in said hopper, a pump carried by said hopper supporting means, the intake side of said pump being connected to said hopper and the output side of said pump being connected to said nozzle, and means for simultaneously operating said agitator means and said pump whereby a predetermined amount of freshly mixed anti-static compound may be forced through said nozzle into the interior of said tube.

Number Name Date Smith Nov. 29, 1904 Osgood Apr. 23, 1912 Fetter Jan. 5, 1932 Miller et a1 June 6, 1939 Kronquest July 18, 1939 Perkins Aug. 8, 1939 Roberts May 20, 1941 Von Sydovv et a1 Sept. 2, 1941 Campbell et a1 Feb. 17, 1942 Bull July 21, 1942 

